drm_hwcomposer: Move vsync tracking into VSyncWorker
Track the timestamp of the last vsync event in VSyncWorker, and provide
an interface for HwcDisplay to enable/disable tracking, and to query the
most recent timestamp.
Moving this into VSyncWorker avoids the need for the VSyncWorker thread
to acquire the global lock.
Change-Id: Ib79d9a6dc5e0f7d6a36ca01dbcda5434a0f582a4
Signed-off-by: Drew Davenport <ddavenport@google.com>
diff --git a/drm/VSyncWorker.h b/drm/VSyncWorker.h
index aff34d8..f0367ae 100644
--- a/drm/VSyncWorker.h
+++ b/drm/VSyncWorker.h
@@ -43,6 +43,12 @@
// Set the expected vsync period.
void SetVsyncPeriodNs(uint32_t vsync_period_ns);
+ // Enable vsync timestamp tracking. GetLastVsyncTimestamp will return 0 if
+ // vsync tracking is disabled, or if no vsync has happened since it was
+ // enabled.
+ void SetVsyncTimestampTracking(bool enabled);
+ uint32_t GetLastVsyncTimestamp();
+
void StopThread();
private:
@@ -66,6 +72,8 @@
static constexpr uint32_t kDefaultVSPeriodNs = 16666666;
// Needs to be threadsafe.
uint32_t vsync_period_ns_ = kDefaultVSPeriodNs;
+ bool enable_vsync_timestamps_ = false;
+ uint32_t last_vsync_timestamp_ = 0;
std::condition_variable cv_;
std::thread vswt_;